source4/libcli/smb2/session.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    SMB2 client session handling
   5
   6    Copyright (C) Andrew Tridgell 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libcli/raw/libcliraw.h"
  24 #include "libcli/smb2/smb2.h"
  25 #include "libcli/smb2/smb2_calls.h"
  26 #include "libcli/composite/composite.h"
  27 #include "auth/gensec/gensec.h"
  28
  29 /*
  30   initialise a smb2_session structure
  31  */
  32 struct smb2_session *smb2_session_init(struct smb2_transport *transport,
  33                                        TALLOC_CTX *parent_ctx, BOOL primary)
  34 {
  35         struct smb2_session *session;
  36         NTSTATUS status;
  37
  38         session = talloc_zero(parent_ctx, struct smb2_session);
  39         if (!session) {
  40                 return NULL;
  41         }
  42         if (primary) {
  43                 session->transport = talloc_steal(session, transport);
  44         } else {
  45                 session->transport = talloc_reference(session, transport);
  46         }
  47
  48         /* prepare a gensec context for later use */
  49         status = gensec_client_start(session, &session->gensec,
  50                                      session->transport->socket->event.ctx);
  51         if (!NT_STATUS_IS_OK(status)) {
  52                 talloc_free(session);
  53                 return NULL;
  54         }
  55
  56         gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
  57
  58         return session;
  59 }
  60
  61 /*
  62   send a session setup request
  63 */
  64 struct smb2_request *smb2_session_setup_send(struct smb2_session *session,
  65                                              struct smb2_session_setup *io)
  66 {
  67         struct smb2_request *req;
  68         NTSTATUS status;
  69
  70         req = smb2_request_init(session->transport, SMB2_OP_SESSSETUP,
  71                                 0x18, True, io->in.secblob.length);
  72         if (req == NULL) return NULL;
  73
  74         SBVAL(req->out.hdr,  SMB2_HDR_UID, session->uid);
  75         SSVAL(req->out.body, 0x02, io->in._pad); /* pad */
  76         SIVAL(req->out.body, 0x04, io->in.unknown2);
  77         SIVAL(req->out.body, 0x08, io->in.unknown3);
  78
  79         req->session = session;
  80
  81         status = smb2_push_o16s16_blob(&req->out, 0x0C, io->in.secblob);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 talloc_free(req);
  84                 return NULL;
  85         }
  86         SBVAL(req->out.body, 0x10, io->in.unknown4);
  87
  88         smb2_transport_send(req);
  89
  90         return req;
  91 }
  92
  93
  94 /*
  95   recv a session setup reply
  96 */
  97 NTSTATUS smb2_session_setup_recv(struct smb2_request *req, TALLOC_CTX *mem_ctx,
  98                                  struct smb2_session_setup *io)
  99 {
 100         NTSTATUS status;
 101
 102         if (!smb2_request_receive(req) ||
 103             (smb2_request_is_error(req) &&
 104              !NT_STATUS_EQUAL(req->status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
 105                 return smb2_request_destroy(req);
 106         }
 107
 108         SMB2_CHECK_PACKET_RECV(req, 0x08, True);
 109
 110         io->out._pad     = SVAL(req->in.body, 0x02);
 111         io->out.uid      = BVAL(req->in.hdr,  SMB2_HDR_UID);
 112
 113         status = smb2_pull_o16s16_blob(&req->in, mem_ctx, req->in.body+0x04, &io->out.secblob);
 114         if (!NT_STATUS_IS_OK(status)) {
 115                 smb2_request_destroy(req);
 116                 return status;
 117         }
 118
 119         return smb2_request_destroy(req);
 120 }
 121
 122 /*
 123   sync session setup request
 124 */
 125 NTSTATUS smb2_session_setup(struct smb2_session *session,
 126                             TALLOC_CTX *mem_ctx, struct smb2_session_setup *io)
 127 {
 128         struct smb2_request *req = smb2_session_setup_send(session, io);
 129         return smb2_session_setup_recv(req, mem_ctx, io);
 130 }
 131
 132
 133 struct smb2_session_state {
 134         struct smb2_session_setup io;
 135         struct smb2_request *req;
 136         NTSTATUS gensec_status;
 137 };
 138
 139 /*
 140   handle continuations of the spnego session setup
 141 */
 142 static void session_request_handler(struct smb2_request *req)
 143 {
 144         struct composite_context *c = talloc_get_type(req->async.private,
 145                                                       struct composite_context);
 146         struct smb2_session_state *state = talloc_get_type(c->private_data,
 147                                                            struct smb2_session_state);
 148         struct smb2_session *session = req->session;
 149
 150         c->status = smb2_session_setup_recv(req, c, &state->io);
 151         if (NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
 152             (NT_STATUS_IS_OK(c->status) &&
 153              NT_STATUS_EQUAL(state->gensec_status, NT_STATUS_MORE_PROCESSING_REQUIRED))) {
 154                 NTSTATUS session_key_err;
 155                 DATA_BLOB session_key;
 156                 c->status = gensec_update(session->gensec, c,
 157                                           state->io.out.secblob,
 158                                           &state->io.in.secblob);
 159                 state->gensec_status = c->status;
 160
 161                 session_key_err = gensec_session_key(session->gensec, &session_key);
 162                 if (NT_STATUS_IS_OK(session_key_err)) {
 163                         session->session_key = session_key;
 164                 }
 165         }
 166
 167         session->uid = state->io.out.uid;
 168
 169         if (NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 170                 state->req = smb2_session_setup_send(session, &state->io);
 171                 if (state->req == NULL) {
 172                         composite_error(c, NT_STATUS_NO_MEMORY);
 173                         return;
 174                 }
 175
 176                 state->req->async.fn = session_request_handler;
 177                 state->req->async.private = c;
 178                 return;
 179         }
 180
 181         if (!NT_STATUS_IS_OK(c->status)) {
 182                 composite_error(c, c->status);
 183                 return;
 184         }
 185
 186         composite_done(c);
 187 }
 188
 189 /*
 190   a composite function that does a full SPNEGO session setup
 191  */
 192 struct composite_context *smb2_session_setup_spnego_send(struct smb2_session *session,
 193                                                          struct cli_credentials *credentials)
 194 {
 195         struct composite_context *c;
 196         struct smb2_session_state *state;
 197
 198         c = composite_create(session, session->transport->socket->event.ctx);
 199         if (c == NULL) return NULL;
 200
 201         state = talloc(c, struct smb2_session_state);
 202         if (composite_nomem(state, c)) return c;
 203         c->private_data = state;
 204
 205         ZERO_STRUCT(state->io);
 206         state->io.in._pad = 0x0000;
 207         state->io.in.unknown2 = 0x0000000F;
 208         state->io.in.unknown3 = 0x00000000;
 209         state->io.in.unknown4 = 0; /* uint64_t */
 210
 211         c->status = gensec_set_credentials(session->gensec, credentials);
 212         if (!composite_is_ok(c)) return c;
 213
 214         c->status = gensec_set_target_hostname(session->gensec,
 215                                                session->transport->socket->hostname);
 216         if (!composite_is_ok(c)) return c;
 217
 218         c->status = gensec_set_target_service(session->gensec, "cifs");
 219         if (!composite_is_ok(c)) return c;
 220
 221         c->status = gensec_start_mech_by_oid(session->gensec, GENSEC_OID_SPNEGO);
 222         if (!composite_is_ok(c)) return c;
 223
 224         c->status = gensec_update(session->gensec, c,
 225                                   session->transport->negotiate.secblob,
 226                                   &state->io.in.secblob);
 227         if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 228                 composite_error(c, c->status);
 229                 return c;
 230         }
 231         state->gensec_status = c->status;
 232
 233         state->req = smb2_session_setup_send(session, &state->io);
 234         composite_continue_smb2(c, state->req, session_request_handler, c);
 235         return c;
 236 }
 237
 238 /*
 239   receive a composite session setup reply
 240 */
 241 NTSTATUS smb2_session_setup_spnego_recv(struct composite_context *c)
 242 {
 243         NTSTATUS status;
 244         status = composite_wait(c);
 245         talloc_free(c);
 246         return status;
 247 }
 248
 249 /*
 250   sync version of smb2_session_setup_spnego
 251 */
 252 NTSTATUS smb2_session_setup_spnego(struct smb2_session *session,
 253                                    struct cli_credentials *credentials)
 254 {
 255         struct composite_context *c = smb2_session_setup_spnego_send(session, credentials);
 256         return smb2_session_setup_spnego_recv(c);
 257 }